Patents
Patents for E21D 19 - Provisional protective covers for working space (559)
09/2005
09/20/2005US6945738 Method and apparatus for safety protection of temporary roof support
07/2005
07/06/2005CN2707965Y I steel round butt joint shed for shaft and drift supporting
05/2005
05/25/2005CN1619105A Method and apparatus for safety protection of temporary roof support
04/2005
04/07/2005US20050073189 Method and apparatus for safety protection of temporary roof support
09/2004
09/22/2004CN2642995Y High-strength type plastic flat net for coal mine down-hole support
09/22/2004CN2642994Y Coal mine protective united net
08/2004
08/25/2004CN2635920Y Anti-falling device for H-bar support of tent
06/2004
06/29/2004US6757642 Method for performing wedge analysis for assessing wedge instabilities in underground openings
06/03/2004WO2004046508A1 Safety device for mines
06/02/2004CN2619053Y Anchor rod support assist top ladder beam
01/2004
01/07/2004CN1133795C Sand pressure release double arch semi-enclosed support technology for soft brenk roc kmining roadway
12/2003
12/31/2003CN2596015Y Net for protecting mining road
10/2003
10/08/2003CN1123674C Supporting method for advancing in loosen and soft surrounding rock
09/2003
09/17/2003CN2573680Y Mine glass fibre grille canopy guard
05/2002
05/10/2002CA2361460A1 Method for performing wedge analysis for assessing wedge instabilities in underground openings
05/03/2002CA2325177A1 Cable line stopping
04/2002
04/23/2002US6375390 Method for widening road, superhighway or railway tunnels, without interrupting the traffic
03/2002
03/07/2002WO2002018749A1 An apparatus for installing a support assembly for a rock structure
12/2001
12/04/2001US6325460 Machine used in connection with underground mining having an operator protective shield
08/2001
08/15/2001CN2443149Y Supporting net for mine
05/2001
05/01/2001US6224164 Mining machine with detachable articulated cutting assembly
03/2001
03/27/2001US6206478 Tunnel excavator with crawler drive and roof support bearing frames
11/2000
11/23/2000WO2000069970A1 Polymeric structural support membrane
11/23/2000CA2372115A1 Polymeric structural support membrane
10/2000
10/12/2000DE19915939A1 Construction device for dam wall between mining face and gallery, has support stands with hydraulic rams and dismantlable shuttering walls
08/2000
08/23/2000CN2392913Y Plastic sheet for support for mine
06/2000
06/14/2000CN1053412C Mining basketry sheet braiding machine
03/2000
03/22/2000CN2370159Y Flexible metal rail net
01/2000
01/12/2000CN1240876A Supporting method for advancing in loose and soft surrounding rock
12/1999
12/02/1999WO1999061546A1 Method and device for consolidating the surfaces of rocky soils
11/1999
11/04/1999WO1999056002A1 Cable line stopping
08/1999
08/17/1999US5938376 Automated temporary roof support, bolter and method
05/1999
05/12/1999CN2318398Y Bar-mat reinforcement flexible separation false bottom
05/05/1999CN1215792A Sand pressure release double arch semi-enclosed support technology for soft break rock mining roadway
12/1998
12/30/1998EP0887512A2 Method for widening road, superhighway or railway tunnels, without interrupting the traffic
11/1998
11/18/1998CN2297541Y Artificial roof plastic cloth for coal mine
07/1998
07/29/1998CN2286799Y Anchored net
03/1998
03/11/1998CN2276078Y Plastic false roof for coal mine underground
02/1998
02/25/1998CN2275162Y Antomatic reused jet for whitewashing materials
02/11/1998CN2274256Y Machine-knitted plastic net for mining use
10/1997
10/15/1997CN1162058A Residue-less pillar recovering method
09/1997
09/04/1997DE19607629A1 Tunnel construction technique
05/1997
05/28/1997CN1035025C Necessary support frame before heading face
01/1997
01/08/1997CN2244617Y Mine roof supporting net for coal face
12/1996
12/25/1996CN2243536Y Pseudo-top fast connecting belt used in coal mine gallery
12/17/1996US5584611 Movable load support
11/1996
11/13/1996CN1135566A Top-support for underground digging
04/1996
04/17/1996CN1120485A Mining basketry sheet braiding machine
01/1996
01/10/1996CN2217103Y Structure for connecting rhombus metallic net with its side of reversed rotated screw like wire
10/1995
10/18/1995CN2210255Y Roof type protective cover for gallery with swing joint
08/1995
08/02/1995CN2204334Y Front-probe support for machine-digging working-surface
07/1995
07/26/1995CN1105734A Necessary support frame before heading face
06/1995
06/28/1995CN2202183Y Flame-retarded and antistatic plastic net for coal mine
10/1994
10/12/1994CN1093437A Hanging equipment for temporary support and protection
09/1994
09/21/1994CN2177805Y Mating support for use front drifting working face
07/1994
07/27/1994CN2172807Y Plastic wall-protecting net for mines
05/1994
05/17/1994US5312206 High lift temporary roof support for mines
04/1994
04/26/1994US5306099 Mine tunnel support system
03/1994
03/23/1994CN2159454Y Hanging apparatus for temporary support
03/02/1994CN1083168A Multifunctional provisional chock for galleries
02/1994
02/16/1994CN2156288Y Plastic screen top
12/1993
12/08/1993CN2148822Y Apparatus for use in drifting roof of archy gallery
11/1993
11/24/1993CN2147351Y Hanging device for tunnelling temporary support
11/24/1993CN2147350Y Temporary roof protector for tunnel
11/17/1993CN2146572Y Push-moving front cantilever
09/1993
09/16/1993DE4206424A1 Plant for introducing reinforcing layer under waste deposits - forms grid of drainage channels in floor of excavated layer and has movable support frame operated in area to be filled.
06/1993
06/30/1993CN2137289Y Temporary props used for fast rescue proping during roof fall of coal mine
05/1993
05/19/1993CN2133672Y Provisional support for tunnelling face
05/19/1993CN1020779C Method of supporting the smectite bearing soft rock tunnel
01/1993
01/05/1993US5176474 Mine tunnel support systems
11/1992
11/12/1992DE4115518A1 Supporting roof of underground gallery - using arches connected to each other by horizontal struts
10/1992
10/20/1992US5156497 Temporary roof support for mines
10/01/1992DE4109880A1 Protection against rock fall in mine - comprises corrugated arched plates located across gallery just under roof, fixed to sidewalls on anchored brackets
05/1992
05/13/1992CN1061071A Method of supporting the smectite bearing soft rock tunnel
05/06/1992EP0484079A1 Improvements in and relating to mine tunnel support systems
04/1992
04/22/1992CN2102372U Safety frame protective barrier
02/1992
02/27/1992DE4026368A1 Method of successive excavation of tunnel - involves cladding face of new excavation and supporting face with gap between them
07/1991
07/10/1991CN2080560U Diamond metal net with side having double row net-connecting hook
06/1991
06/13/1991DE3940249A1 Making safe conveyor and cutting areas in mine - involves box-like staging which can be moved in phase with driving shield
06/06/1991DE4011907A1 Roadway heading chamber for temporary support of mining tunnel - comprises front and rear sections with roof supports and back-filled support all carried on framework
02/1991
02/26/1991CA1280614C Underground mining and quarrying operation through descending stripping and undercaving, and related installation
01/1991
01/16/1991CN1048580A Telescopic flexible metal shield
12/1990
12/25/1990US4979780 Mining or underground quarrying method and installation for implementing same
08/1990
08/30/1990DE3906150A1 Temporary support for underground roadways
07/1990
07/05/1990DE3923376C1 Self propelling machine for mining coal - comprises platform supported by vertical hydraulic jacks and raking jacks
05/1990
05/17/1990DE3838095A1 Active face protection
05/03/1990DE3902331C1 Face protection for roadway driving
03/1990
03/15/1990DE3828641A1 Face protection with bracing in several planes
11/1989
11/30/1989DE3817420A1 Heading-face protection
09/1989
09/27/1989CN1035866A Contractible and suspended struture supporting method
08/1989
08/24/1989DE3904012A1 Grubenausbau zur gewaehrleistung der bergsicherheit in grubenraeumen Mine roof to ensure the safety mountain in grubenraeumen
08/16/1989CN1034782A Suntaining-network method with flexible plastic rock bolts
07/1989
07/13/1989DE3800046A1 Support for a crown kerf
04/1989
04/05/1989CN2035384U Net-shaped articulated cap
02/1989
02/22/1989CN2033056U Metal net for spraying anchor support
11/1988
11/03/1988DE3813905A1 Roadway driving chamber for the temporary support of a roadhead in underground mining
08/1988
08/03/1988CN87201589U Portable hydraulic network connector
06/1988
06/15/1988CN85205290U Automatic protective system for thick coal seam slice mining
12/1987
12/23/1987EP0250286A1 Underground mining process using downwardly directed stoping and caving, and installation for carrying this out
12/01/1987US4710064 Movable roof support and bolter system
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